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Sat, 05 Sep 2026 15:52:34 -0700 (PDT) From: =?UTF-8?q?=C3=96mer=20Mete=20Kaya?= To: netdev@vger.kernel.org Cc: david@ixit.cz, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, oe-linux-nfc@lists.linux.dev, linux-kernel@vger.kernel.org, =?UTF-8?q?=C3=96mer=20Mete=20Kaya?= , syzbot+1e3df0852e82c21ca418@syzkaller.appspotmail.com Subject: [PATCH net v2] nfc: llcp: fix slab-out-of-bounds read in nfc_llcp_wks_sap() Date: Sun, 6 Sep 2026 01:48:43 +0300 Message-ID: <20260905225211.596366-1-omermetekaya0@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260903165014.497490-1-omermetekaya0@gmail.com> References: <20260903165014.497490-1-omermetekaya0@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit nfc_llcp_wks_sap() passes service_name to pr_debug() using the %s format specifier. The service_name buffer is allocated via kmemdup() in llcp_sock_bind() and is not null-terminated, causing __dynamic_pr_debug() to read beyond the allocated region: KASAN: slab-out-of-bounds Read in __dynamic_pr_debug Fix by using %.*s with service_name_len to limit the output to the actual length of the string. Reported-by: syzbot+1e3df0852e82c21ca418@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=1e3df0852e82c21ca418 Signed-off-by: Ömer Mete Kaya --- v2: Changed prefix to [PATCH net] but still I could not find the Fixes: tag both in the gitblame and the lore. net/nfc/llcp_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c index cac1b5487064..fda236e4d9fd 100644 --- a/net/nfc/llcp_core.c +++ b/net/nfc/llcp_core.c @@ -341,7 +341,7 @@ static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len) { int sap, num_wks; - pr_debug("%s\n", service_name); + pr_debug("%.*s\n", (int)service_name_len, service_name); if (service_name == NULL) return -EINVAL; -- 2.55.0